Telegraph instrument.



No. 812,773. PATENTED FEB. 13, 1906.

0. J; SGHWARZE.

TELEGRAPH INSTRUMENT. APPLICATION TILED MAY 31, 1904 l' l i H I I I lllll J MMMMM. 4

a2 TJJBU/Wdd 3o embody my present invention.

50 tween the armature 8 an UNITED STATES PATENT- OFFICE.

CARL J. SCHWARZE, OF ADRIAN, MICHIGAN, A'SSIGNOR TO SCHWARZE ELECTRIC COMPANY, OF MICHIGAN.

ADRIAN, MICHIGAN A CORPORATION OF a TELEGRAPH INSTRUMENT.

ul Improvement in Telegraph Instruments,

of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part in of this specification.

.My invention relates to telegraph instruments; and its principal object is to increase the efiiciency and effectiveness of such instruments and to prevent the production of 1 sparks in their operation.

In accordance with my present invention I provide the operating-magnet of the instrument with a closed secondary coil, so that the changes in magnetic flux caused by the mak- 29 ing and breaking of the circuit operate to induce currents in such-secondary c'oil. This delays the changes in magnetic flux and absorbs the inductive energy, thereby preventing the roduction of sparks at break. In

2 5 this app ication I show both a relay and a sounder operating on this general principle. In the accompanying drawin the figure is a view of a telegraph system, sl iowing a key, a relay, and a sounder, whereof the two latter Referring to the figure, A is thetelegraphkey, which can be of any suitable orpreferred construction. The key shown vcomprises a, base 1, having a ivoted key-lever 2, which 5 is adaptedto ma e connection with a con-- tact .3 to close and 0 en the circuit.

B. isa relay, and isa sounder, the relay B being connected by a circuit 4 with the key. A'and the sounder being connected by a cir-v 40 cuit 5 6 withfthe relay B. The relay B is provided with an electromagnet 7, having its coil included in the circuit 4, and is also pro-' vided with a vibratory armature;8, adapted to be controlled by the magnet 7. A post 9 5 is provided with a/contactiece 10'. and'an ad usting-screw 11,'by whic the movement .of the armature 8 is controlled and the circuit 5 6 to the sounder C closed whenthe armature 8 is attracted. A 'sprin 12 extends bean adjustable thumb-screw 13, so as to hold the armature 8. normally in retracted position away from the magnet 7. The magnet 7 isprovided with a closedinduction-coil 14, consisting of a coil of comparatively fine Wire having its ends connected together,'so as to form a closed circuit. This closed induction-coil acts as a secondary for the "coil of the magnet 7, thereby opposing the changes'in magnetic flux in the core of'said magnet and preventing the formation of sparks at the key A when the circuit is broken thereat. It also acts to de-- lay the magnet changes in the core, and thereby secure greater amplitude of movement on the part of the armature. V

The sounder C is constructed with a base 15, and posts 16 and 17, rising therefrom with an electromagne-t 18 arranged upon the base between said posts. The armature 19 is piv oted to the post 16 and is provided with an adjusting-screw 20, by which its contact with the top of the post 17 is regulated. The post 17 is provided with an adjusting-screw2l to regulate the upstrokeof said lever. A spring 22 holds the lever 19 normally in retracted position. The coil 23 of the magnet 18 isineluded in the circuit 5 6, extending from the relay B. A- closed induction-coil 24 is arranged upon the magnet 18, .this coil being conveniently in the form of a fine-wire coil, with its ends connected to ether, the same in'general arrangement and or the same purposes as the coil 14 of the relay B, the coil'24 acting to prevent sparking at the relay B when the sounder-circuit is opened at'the re' lay and also acting to secure a-more efficient operation of the sounder C.

It will be understood that changes and Patented Feb. 13, 1906.

modifications can 'be made in the devices herein disclosed without departing from the spirit of the invention. a (I 1 What I claim is 1. In atelegraph instrument, the combination of an armature-actuating energizing-g coil, ,and .a closed secondary inductively related to said energizing-coil. I 3

2. A telegraph instrument provided with an induction device .on the armature-actuating electrom'agnet of the instrument so that changes in the magnetic intensity of said magnet have an inductive eflectn'on said 1n ductive device,.substantially as described.

3. A telegra hiinstrument having an electromagnet an armature actuated thereby and also having a closed induction-coil inductively related to said electromagnet, substantially as described.

4. A telegraph instrument having an electromagnet provided with a closed inductionconductor in combination with an armature actuated by said magnet, substantially as described.

5. Atelegraph instrument comprising an electromagnet, a Vibratory armature therefor, spring means controlling said armature and holding the same normally retracted, a stop against which said armature is normally held, and a closed induction-coil on said electromagnet, substantially as described.

6. A telegraph instrument having its armature-actuatmg electromagnets provided with closed induction-coils, substantially as described.

In witness whereof I hereunto subscribe my name this Qthday of May, A. D. 1904.

CARL J. SCHWARZE. Witnesses:

WALTER E. 000K, JENNIE 0. W001). 

